Yes, they are the big reservoirs in Wales. Used to go there as a schoolboy many years ago.

Historical too because that's where Sir Barnes Wallis trialed and perfected the "bouncing bomb", a very successful device used by The Dambusters against the Germans in the Second World War. The dams in the Saar and Ruhr valleys in Germany took some very big hits disrupting hydro electric power. He was one of my schoolboy heroes. Jim Clark was another